subscribe websocket on frontend

This block is part of the websocket group and was last modified in core v10.4.28.

subscribe websocket on frontend condition v10.4.28

Subscribes the websocket to a specific channel. All broadcasts will be pushed to that spark / the frontend.

In pins 4 + flow

flow
flow
channels required
array
Hidden when other fields are filled
channel required
value
A channel you would like the server to subscribe / listen on • Hidden when other fields are filled
events
array
Listen on the provided events. If you would like to listen on all events within this channel, leave this array empty or provide * as one of the values.
Default ["*"]
skip jwt required
condition
Skips the broadcast of subscriptions to the frontend. If set to true, the frontend will not be able to resubscribe on the channels where the broadcast was skipped.
Default false

Out pins 3 + flow

flow
flow
success
condition
error
value
channels
array

Subscribes the current WebSocket connection to the given channels (channels array and channel pin merged, duplicates removed) so later broadcasts on them reach this client; the channels out pin lists the channels that actually subscribed. Scoped to the events list when wired, all events when empty. success=false with error MISSING_CHANNELS when no channel resolves, MISSING_WEBSOCKET when there is no connection, or PRODUCTION_RUN_ONLY in simulation. Unless skipjwt is true, the new subscription set is broadcast to the frontend.

A typical wiring for subscribe websocket on frontend: a function trigger starts the flow; with values feeds the channels pin; the flow out pin feeds debug.

Version history

Introduced in v10.4.28.

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